AC-21 Information Sharing. Enable authorized users to determine whether access authorizations assigned to a sharing partner match the information's access and use restrictions for [organization-defined] ; and Employ [organization-defined] to assist users in making information
Information Sharing. Enable authorized users to determine whether access authorizations assigned to a sharing partner match the information's access and use restrictions for [organization-defined] ; and Employ [organizat.
5
artefacts
0
held by a system
1
at each review
hard
to go live
Policy repository / GRC workspace
where the evidence lives
teal = a system already holds it · olive = produced at each review
system holds itEvidence a system already holds
none for this control
periodic reviewEvidence produced at each review
- The automated mechanism or aid presented to the user at the point of sharing, with a screenshot of what it shows · Identity provider / directory
governing documentDocuments that govern the control
- Defined list of information sharing circumstances where user discretion is required · Policy repository / GRC workspace
- Names or roles of the users authorised to make a sharing decision · Policy repository / GRC workspace
- Sample sharing decisions showing the partner's access authorisations were compared against the information's use restrictions · Policy repository / GRC workspace
- Access and use restrictions recorded against the shared information itself · Policy repository / GRC workspace
First move
This control is evidenced by people and documents, not systems. Put the document under version control with an owner and review date, and log each review as a record with reviewer and date. Do not try to automate it.
Common gaps auditors find
- Sharing left to individual judgement with no aid, so the user cannot see the partner's authorisations
- Restrictions attached to the information at classification but not carried into the sharing interface
- Decision recorded nowhere, so a disputed disclosure cannot be reconstructed
Do this for your whole sheet
Paste the rows you run your controls from and get this mapping for every control at once, with the periodic-review ones flagged and a first move per row. No account for the first run.
Build my evidence sheetAC-20 Use of external systems · AC-22 Publicly accessible content